term used to identify someone as multiracial; pretty derogatory word for a multiracial person, at least in the eyes of someone who is multiracial him/herself (because of the word's use in labeling a dog as inferior as a result of impure breeding)

i think it is obnoxious of you to call me a mutt; i'm not inferior to you because my parents are two different races.

A mutt is a person of a multi-racial background, depending on who you are talking to it can be considered offensive and/or derogatory. In a lot of cases people don't take offense to it(I personally call myself a mutt all the time) Just be careful who you call a mutt, some people won't take it very well.

Ex 1)

Anthony: what are you, you look Hispanic?

Me: I'm a mutt...

Anthony: Me too!

Ex 2)

person1: what is she, I can't tell?

person2: I'm not sure, she's some crazy mix.

person1: Oh, so she's a mutt.

person3: Who are you calling a mutt, you're no better than me just cause I'm multiracial!